Keep in mind where you are coming from! We live in South Florida and when it hits 70 I'm throwing on long sleeves, 65? out come the sweaters! But that's because I'm used to just massive heat and I have thinned out Florida blood! When I go home to Chicago, I'm FREEZING, and getting yelled at for turning the heat on too high. So if your coming from a cold climate, it's going to seem even warmer to you. I remember in the spring the first time it would be 60 degrees out, I'd be wearing a t-shirt outside because it felt so warm after a long winter. Not anymore! LOL
But anywho, when we've gone in February, I usually wear shorts and t-shirt, but wear a button down shirt or jacket over it in the morning until it warms up, then i take it off.